830 PROCEEDINGS OF THE NATIONAL MUSEUM. 



The following are un figured species of Grandidieria : 



G. rotundata Bourguignat, Not. Prod., 1885, p. 98. 

 G. mira Bourguignat, Not. Prod., 1885, p. 96. 

 G. locardiana Bourguignat, Esp. Ouk., 1885, p. 18. 

 G. incarnata Bourguignat, Moll. Gir., 1885, p. 101. 

 G. giraudi Bourguignat, Not. Prod., 1885, p. 95. 

 G. elomjata Bourguiguat, Moll. Gir., 1885, p. 14. 



Genus PHYSUNIO, Simpson, 19OO. 

 (Type, Unio graeidus Lea.) 



Shell thiii, irregularly obovate, narrowed in front, decidedly produced 

 at post base, pointed behind and posteriorly winged, with a moderate 

 posterior ridge and often a second or third faint ridge above it; beak 

 sculpture zigzag radial, somewhat disposed in two sets, the one down 

 the posterior ridge slightly nodulous; posterior slope having irregular 

 radial corrugations, the rest of the shell smooth; epidermis often cloth- 

 like, with one or more green rays on the posterior slope; hinge line 

 curved; a single obliquely grauularly striate pseudocardiual and gen- 

 erally three laterals in the left valve, and two pseudocardinals and two 

 laterals in the right, all greatly compressed; beak cavities deep; mus- 

 cle scars irregular; nacre bright, bluish, and iridescent. 



Animal unknown. 



Section PHYSUNIO Simpson, 1900. 



(Type, Unio gravidus Lea.) 

 Shell inflated; beak cavities deep and rounded. 



f PHYSUNIO GRAVIDUS Lea. 



* UniograridusL-EA, Pr. Ac. N. Sci. Phila.,VJII, 1856, p. 93; Obs., VI, 1857, p. 12, pi. 



xxiv, fig. 5; Jl. Ac. N. Sci. Phila., Ill, 1858, p. 292, pi. xxiv, fig. 5. 

 * VON MARTENS, Pr. Zool. Soc. Lond., 1860, p. 14. * SOWERBY, Conch. Icon., 

 XVI, 1866, pi. LII, fig. 271. *MOREJLET, Ser. Conch., IV, 1875, p. 347. 

 *P.ETEL, Conch. Sam., Ill, 1890, p. 154. 



* Margaron ( Unio) gravidus LEA, Syn., 1870, p. 28. 



* Lampsilis gravidus ROCHEBRUNE, Bull. Soc. Phil., VI, 1882, p. 43. 



* Unio alnormis MOBELET, Rev. et Mag., XIV, 1862, p. 480. 



s Unio 8uperl)U8 SOWERBY, Conch. Icon., XVI, 1867, p. LIX, fig. 295. 



Siam; Cambodia; Cochin China. 



t PHYSUNIO SUPERBUS Lea. 



* Unio superbus LEA, Desc. 12 New Uniones. 1843 (no pagination); Tr. Am. Phil. 



Soc., IX, 1845, p. 281, pi. XLII, fig. 11; Obs., IV, 1848, p. 39, pi. XLII, fig. 11. 

 H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 498. * VON MARTENS, Mai. 

 Bl., XIV, 1866, p. 14. *P.ETEL, Conch. Sam., Ill, 1890, p. 169. 

 * Margaron (Unio) superbus LEA, Syn", 1852, p. 19; 1870, p. 28. 



* Unio velaris HANLEY, Biv. Shells, 1856, p. 385, pi. xxm, fig. 42.' 



*Unio massini MOUELET, Jl. de Conch., XII, 1864, p. 288; Ser. Conch., IV, 1875, 

 p. 348, pi. xv, figs. 1, 3. V P^TEL, Conch. Sam., Ill, 1890, p. 158. 



Sumatra; Cochin China. 



1 Credited to Benson manuscript. 



